I upgraded to PE 9 from PE 8 and now video does not play back in the main window. I can click on the window and see a still for that point in time, but not video.
I do get a video card incompatability notice when I start it up, but I believe it does supposed by video adapter, an NVIDA GeForce 8800 GT. The computer, a Dell PC, has 4 gigs of RAM.
As best as I can tell, the driver is the latest available, 188.8.131.5258 dated 1/7/2011.
Worked fine with PE 8.
Exported mp4 video plays correctly in Quicktime